Silver ion antibacterial non-woven fabric for masks and preparation method thereof

Abstract

The present invention relates to a silver ion antibacterial non-woven fabric for masks and a preparation method thereof, belonging to the technical field of functional fabrics. The antibacterial non-woven fabric uses a needle-punched non-woven fabric as a substrate and is loaded with self-made silver-based antibacterial particles. The composite antibacterial agent uses tetrapod-shaped zinc oxide whiskers as a carrier, and is modified by introducing sulfur-containing groups and primary alcohol groups on the surface. The primary alcohol is then oxidized to aldehyde groups using a silver catalyst, and silver yttrium is adsorbed and reduced to form a silver-yttrium element-loaded structure. The silver generates active oxygen groups that interfere with the activity and function of bacteria, and the yttrium element promotes the generation of active oxygen groups by silver, resulting in an excellent antibacterial effect. Furthermore, sodium alginate is used as the main film-forming material, and starch and gelatin are compounded to improve initial adhesion. A water-soluble coating is formed on the surface of the composite antibacterial agent. When used in a mask, the composite antibacterial agent dissolves with exhaled moist air, releasing antibacterial components. Testing has shown that the resulting antibacterial non-woven fabric can exert a stable antibacterial effect within 24 hours.

Description

Technical Field

[0001] The present invention belongs to the technical field of functional fabrics, and in particular relates to a silver ion antibacterial non-woven fabric for masks and a preparation method thereof. Background Art

[0002] Respiratory infectious diseases can be transmitted through air and droplets, and can easily cause large-scale concentrated infections in the population. Cutting off the transmission routes of pathogens is an effective means of protecting people's health. Many countries have stockpiled protective masks as a means of non-drug intervention to control the spread of pathogens.

[0003] The mask surface of a general mask is divided into three layers: inner, middle and outer. The inner layer is made of skin-friendly material, the middle layer is an isolation filter layer, and the outer layer is an antibacterial layer made of special materials. The mask has certain dust-proof and bacteria-filtering functions, but cannot kill pathogens, and the bacteria are blocked in the mask. If not handled properly, it will cause secondary infection. Therefore, various antibacterial masks have been developed in the prior art, among which silver-based antibacterial masks are the most widely used. The main technical solution is to use silver-based antibacterial materials to make the filter material of the mask to achieve antibacterial effect. For example, the sputtered nano-silver non-woven fabric developed by Taiwan Yinjia Company has an antibacterial effect by sputtering nano-silver on the filter layer. However, the manufacturing process of this method is complicated, and the silver-based antibacterial material is directly in contact with the air and deteriorates, which greatly reduces the antibacterial effect. Therefore, the present application aims to develop an efficient and stable silver-based antibacterial non-woven fabric for use in masks. Summary of the Invention

[0004] In order to solve the technical problems mentioned in the background technology, the purpose of the present invention is to provide a silver ion antibacterial non-woven fabric for masks and a preparation method thereof.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] A silver ion antibacterial non-woven fabric for masks comprises a needle-punched non-woven fabric and antibacterial particles loaded in the needle-punched non-woven fabric; wherein the antibacterial particles are coated with a composite antibacterial agent.

[0007] The composite antibacterial agent is prepared by the following method:

[0008] Step A1: γ-mercaptopropyltriethoxysilane and deionized water are mixed, the pH value is adjusted to 5.0-6.0, and the mixture is stirred at room temperature for a first stirring time until fully hydrolyzed. Tetrapod-shaped zinc oxide whiskers are then added and ultrasonically dispersed. The pH value is adjusted to 7.0-8.0. The mixture is allowed to stand for aging. After the reaction, the supernatant is removed, the mixture is washed with ethanol, and the lower concentrate is centrifuged and freeze-dried to obtain a coupling matrix.

[0009] Step A2: 1-thioglycerol and ethanol solution are mixed, the coupling matrix is ​​added and ultrasonically dispersed, the temperature is raised to 55-65°C, and stirred at a first stirring speed, while ammonia is added dropwise to react, and then a silver catalyst is added, and the temperature is continued to be raised to 90-100°C and evaporated to dryness, and the evaporated product is used to obtain a modified matrix;

[0010] Step A3: Silver nitrate and yttrium chloride are dissolved in deionized water, heated to 75-80°C under nitrogen protection, ammonia water is added to adjust the pH value to 8.5, and then the modified matrix is ​​added and ultrasonically dispersed. The lower precipitate is removed by centrifugation and dried in nitrogen to prepare a composite antibacterial agent.

[0011] Furthermore, in step A1, the first stirring time is 10-12 hours, and the static aging time is 24 hours.

[0012] Furthermore, in step A2, the first stirring speed is 800-1000 rpm, and the time for dropwise addition of ammonia water to react is 2-3 hours.

[0013] Furthermore, in step A3, ultrasonic dispersion is performed for 1.5-2 hours.

[0014] Furthermore, in step A1, the usage ratio of γ-mercaptopropyltriethoxysilane and tetrapod-shaped zinc oxide whiskers is (2.6-3.2 mL):10 g.

[0015] Furthermore, in step A2, the usage ratio of 1-thioglycerol and coupling matrix is ​​(1.8-2.5 mL): 10 g.

[0016] Furthermore, in step A3, the usage ratio of the modified substrate, silver nitrate and yttrium chloride is 10 g: (25-35 mmol): (3-5 mmol).

[0017] Furthermore, the preparation method of the antibacterial microparticles comprises the following steps:

[0018] Step B1: Dissolve sodium alginate, gelatin, starch, and deionized water at a solid content of 1.2-1.4% by stirring, adjust the pH to 9.5-10.0, raise the temperature to 70-80°C, and stir to mix to prepare a coating solution;

[0019] Step B2: The coating liquid is coated on the surface of the composite antibacterial agent through a spray coating machine, and is dried and dispersed with hot carbon dioxide to prepare antibacterial microparticles.

[0020] Furthermore, the mass ratio of sodium alginate, gelatin and starch is 1:(0.08-0.12):(0.15-0.2).

[0021] A method for preparing silver ion antibacterial non-woven fabric for masks, comprising the following steps:

[0022] Step S1: mixing the antibacterial microparticles and anhydrous ethanol at a solid-liquid ratio of 1:(20-30), and ultrasonically dispersing them into a suspension to prepare a loading liquid;

[0023] Step S2: Place the needle-punched nonwoven fabric in a vacuum kettle, evacuate to below 100 Pa, then introduce a load liquid to a constant pressure, take out the nonwoven fabric and dry it with dry air to produce an antibacterial nonwoven fabric.

[0024] Beneficial effects of the present invention:

[0025] 1. The present invention prepares a silver ion antibacterial non-woven fabric for masks. The fabric uses a needle-punched non-woven fabric as a base material, which has excellent filtration protection and moisture absorption properties. The needle-punched non-woven fabric is loaded with a self-made silver antibacterial microparticle coated with a composite antibacterial agent, which has excellent anti-oxidation and anti-deterioration effects and can exert a stable antibacterial effect.

[0026] 2. Among them, the composite antibacterial agent uses four-needle zinc oxide whiskers as a carrier, and is treated with γ-mercaptopropyltriethoxysilane coupling to graft a thiol-containing organic group on the surface. It is then oxidized and condensed with 1-thioglycerol to introduce a sulfur-containing group and a primary alcohol group, which is then oxidized into an aldehyde group by a silver catalyst. Under hydrothermal conditions, the sulfur-containing group adsorbs silver and yttrium ions. In the ion enrichment layer on the surface of the substrate, the surface aldehyde group reduces the silver yttrium element to form silver yttrium particles loaded on the surface of the substrate. Compared with traditional loaded silver antibacterial agents, the four-needle zinc oxide whiskers have a needle-shaped surface structure, which itself has a certain antibacterial effect and provides more loading sites, which is conducive to the loading of silver yttrium elements. Silver has a good killing effect on bacteria. The main reason is that in a humid environment, silver produces active oxygen groups, which interfere with the activity and function of bacteria. Studies have found that yttrium can greatly promote the generation of active oxygen groups by silver. The two are loaded together to achieve excellent antibacterial effect.

[0027] 3. In addition, the present invention uses sodium alginate as the main film-forming material, and its viscosity is greatly reduced under alkaline and high-temperature conditions, which is beneficial to the uniformity of the coating. The initial adhesion is improved by compounding starch and gelatin, and the composite antibacterial agent is coated for protection, effectively preventing the loaded silver yttrium functional material from deteriorating in the air, resulting in a decrease in the antibacterial effect. The film layer is a water-soluble film layer, and when used in a mask, it can dissolve with the exhaled moist gas and release antibacterial components. After testing, the antibacterial non-woven fabric prepared can exert a stable antibacterial effect within 24 hours. DETAILED DESCRIPTION

[0028] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0029] Example 1

[0030] This embodiment prepares a silver ion antibacterial non-woven fabric for masks, and the specific preparation process is as follows:

[0031] 1) Preparation of composite antibacterial agent

[0032] a1. Take γ-mercaptopropyltriethoxysilane and deionized water in a volume ratio of 1:50 and dilute and mix them. Add dilute hydrochloric acid to adjust the pH to 6.0. Stir at 120 rpm for 12 h at room temperature to fully hydrolyze. Then, add four-needle zinc oxide whiskers at a dosage of 2.6 mL / 10 g of γ-mercaptopropyltriethoxysilane. The four-needle zinc oxide whiskers are supplied by Wuhu Jikang New Materials Technology Co., Ltd. and are model WZX5. The same batch of raw materials is used below. Ultrasonic dispersion is performed at 28 kHz for 20 min. Sodium hydroxide solution is added dropwise during ultrasonic dispersion to adjust the pH to 7.0. The mixture is then allowed to stand for 24 h. After aging, the supernatant is removed and washed with 2 times the amount of 30% ethanol solution of the precipitate. The lower layer of concentrate is centrifuged and freeze-dried to prepare a coupling matrix.

[0033] a2. Stir and dissolve 1-thioglycerol and 55% ethanol solution in a volume ratio of 1:35, then add the coupling matrix at a rate of 1.8 mL / 10 g of 1-thioglycerol, continue ultrasonic dispersion at 28 kHz for 8 min, heat to 55° C., stir at 800 rpm, slowly add dropwise 8% of the reaction system volume and 5% ammonia water over 2 h, then keep warm for reaction, controlling the addition of ammonia water for 3 h, add a mesh silver catalyst after the reaction, continue heating to 90° C., evaporate to dryness, and take the evaporated product modified matrix;

[0034] a3. Take silver nitrate and yttrium chloride as raw materials, add deionized water dropwise and stir until completely dissolved, introduce nitrogen protection, raise the temperature to 75°C, add ammonia water to adjust the pH value to 8.5, then add the modified matrix, ultrasonically disperse at 33kHz for 2h, then centrifuge and remove the lower precipitate, dry it in nitrogen, and prepare a composite antibacterial agent, wherein the usage ratio of the modified matrix, silver nitrate and yttrium chloride is 10g:25mmol:5mmol.

[0035] 2) Composite antimicrobial coating

[0036] b1. Mix sodium alginate, gelatin, and starch in a weight ratio of 1:0.12:0.15, add deionized water and stir to dissolve until the solid content reaches 1.2%, add sodium hydroxide solution to adjust the pH to 9.5, heat to 70°C, and stir at 800 rpm for 5 minutes to prepare a coating solution;

[0037] b2. Add the coating liquid into the hopper of the spray coating machine, add the composite antibacterial agent into the drum, set the rotation speed to 60 rpm, the spray pressure of the coating liquid to 2.5 MPa, coat the coating liquid on the surface of the composite antibacterial agent, dry the discharged material with 80°C hot carbon dioxide gas, and then place it in an air flow disperser to disperse it to make antibacterial particles.

[0038] 3) Preparation of antibacterial non-woven fabrics

[0039] s1. Take anhydrous ethanol, add antibacterial microparticles at a solid-liquid ratio of 1:30, mix, and ultrasonically disperse at 20 kHz for 10 minutes to disperse the antibacterial microparticles in the anhydrous ethanol to form a suspension state to prepare a loading liquid;

[0040] s2. Place the needle-punched nonwoven fabric in a vacuum kettle, evacuate to 100 Pa, then introduce the load liquid into the vacuum kettle until constant pressure is achieved, take out the nonwoven fabric and place it in a tunnel oven, dry it in 60°C dry air for 3 hours to make an antibacterial nonwoven fabric.

[0041] Example 2

[0042] This embodiment prepares a silver ion antibacterial non-woven fabric for masks, and the specific preparation process is as follows:

[0043] 1) Preparation of composite antibacterial agent

[0044] a1. Dilute and mix γ-mercaptopropyltriethoxysilane and deionized water in a volume ratio of 1:40, add dilute hydrochloric acid to adjust the pH to 5.0, stir at 120 rpm for 10 h at room temperature to fully hydrolyze, then add tetrapod-shaped zinc oxide whiskers at a dosage of 3.2 mL / 10 g of γ-mercaptopropyltriethoxysilane, ultrasonically disperse at 28 kHz for 15 min, and add sodium hydroxide solution while ultrasonically dispersing to adjust the pH to 8.0. Then, let it stand for 24 h, remove the supernatant after aging, add 30% ethanol solution 3 times the amount of the precipitate to wash, centrifuge and remove the concentrate, freeze-drying to prepare a coupling matrix;

[0045] a2. Stir and dissolve 1-thioglycerol and 55% ethanol solution in a volume ratio of 1:30, then add the coupling matrix at a rate of 2.5 mL / 10 g of 1-thioglycerol, continue ultrasonic dispersion at 28 kHz for 5 min, heat to 65° C., stir at 1000 rpm, slowly add dropwise 8% of the reaction system volume and 5% ammonia water over 1 h, then keep warm for reaction, controlling the addition of ammonia water for 2 h, add a mesh silver catalyst after the reaction, continue heating to 100° C., evaporate to dryness, and take the evaporated product modified matrix;

[0046] a3. Take silver nitrate and yttrium chloride as raw materials, add deionized water dropwise and stir until completely dissolved, introduce nitrogen protection, raise the temperature to 80°C, add ammonia water to adjust the pH value to 8.5, then add the modified matrix, ultrasonically disperse at 33kHz for 1.5h, then centrifuge and remove the lower precipitate, dry it in nitrogen, and prepare a composite antibacterial agent, wherein the usage ratio of the modified matrix, silver nitrate and yttrium chloride is 10g:35mmol:3mmol.

[0047] 2) Composite antimicrobial coating

[0048] b1. Mix sodium alginate, gelatin, and starch in a weight ratio of 1:0.08:0.2, add deionized water and stir to dissolve until the solid content reaches 1.4%, add sodium hydroxide solution to adjust the pH to 10.0, heat to 80°C, and stir at 800 rpm for 3 minutes to prepare a coating solution;

[0049] b2. Add the coating liquid into the hopper of the spray coating machine, add the composite antibacterial agent into the drum, set the rotation speed to 60 rpm, the spray pressure of the coating liquid to 2.5 MPa, coat the coating liquid on the surface of the composite antibacterial agent, dry the discharged material with 80°C hot carbon dioxide gas, and then place it in an air flow disperser to disperse it to make antibacterial particles.

[0050] 3) Preparation of antibacterial non-woven fabrics

[0051] s1. Take anhydrous ethanol, add antibacterial microparticles at a solid-liquid ratio of 1:20, and mix them. Ultrasonic dispersion is performed at 28 kHz for 6 minutes to disperse the antibacterial microparticles in the anhydrous ethanol to form a suspension state to prepare a loading liquid.

[0052] s2. Place the needle-punched nonwoven fabric in a vacuum kettle, evacuate to 100 Pa, then introduce the load liquid into the vacuum kettle until constant pressure is achieved, take out the nonwoven fabric and place it in a tunnel oven, dry it in 60°C dry air for 3 hours to make an antibacterial nonwoven fabric.

[0053] Example 3

[0054] This embodiment prepares a silver ion antibacterial non-woven fabric for masks, and the specific preparation process is as follows:

[0055] 1) Preparation of composite antibacterial agent

[0056] a1. Dilute and mix γ-mercaptopropyltriethoxysilane and deionized water in a volume ratio of 1:40, add dilute hydrochloric acid to adjust the pH to 5.5, stir at 120 rpm for 12 h at room temperature to fully hydrolyze, then add tetrapod-shaped zinc oxide whiskers at a dosage of 3.0 mL / 10 g of γ-mercaptopropyltriethoxysilane, ultrasonically disperse at 28 kHz for 18 min, and add sodium hydroxide solution while ultrasonically dispersing to adjust the pH to 7.5. Then, let it stand for 24 h, remove the supernatant after aging, add 30% ethanol solution 3 times the amount of the precipitate to wash, centrifuge and remove the concentrate, freeze-dry to prepare a coupling matrix;

[0057] a2. Stir and dissolve 1-thioglycerol and 55% ethanol solution in a volume ratio of 1:35, then add the coupling matrix at a rate of 2.2 mL / 10 g of 1-thioglycerol, continue ultrasonic dispersion at 28 kHz for 7 min, heat to 60° C., stir at 1000 rpm, slowly add dropwise 8% of the reaction system volume and 5% ammonia water over 1.5 h, then keep warm for reaction, controlling the addition of ammonia water for 2.8 h. After the reaction, add a reticulated silver catalyst, continue heating to 100° C., evaporate to dryness, and take the evaporated product modified matrix;

[0058] a3. Take silver nitrate and yttrium chloride as raw materials, add deionized water dropwise and stir until completely dissolved, introduce nitrogen protection, raise the temperature to 80°C, add ammonia water to adjust the pH value to 8.5, then add the modified matrix, ultrasonically disperse at 33kHz for 1.8h, then centrifuge and remove the lower precipitate, dry it in nitrogen, and prepare a composite antibacterial agent, wherein the amount ratio of modified matrix, silver nitrate and yttrium chloride is 10g:30mmol:5mmol.

[0059] 2) Composite antimicrobial coating

[0060] b1. Mix sodium alginate, gelatin, and starch in a weight ratio of 1:0.1:0.18, add deionized water to a solid content of 1.3%, and stir to dissolve. Add sodium hydroxide solution to adjust the pH to 10.0, heat to 75°C, and stir at 800 rpm for 4 minutes to prepare a coating solution.

[0061] b2. Add the coating liquid into the hopper of the spray coating machine, add the composite antibacterial agent into the drum, set the rotation speed to 60 rpm, the spray pressure of the coating liquid to 2.5 MPa, coat the coating liquid on the surface of the composite antibacterial agent, dry the discharged material with 80°C hot carbon dioxide gas, and then place it in an air flow disperser to disperse it to make antibacterial particles.

[0062] 3) Preparation of antibacterial non-woven fabrics

[0063] s1. Take anhydrous ethanol, add antibacterial microparticles according to the solid-liquid ratio of 1:25, and mix them. Place them under ultrasonic dispersion at 28 kHz for 8 minutes to disperse the antibacterial microparticles in the anhydrous ethanol to form a suspension state to prepare a loading liquid;

[0064] s2. Place the needle-punched nonwoven fabric in a vacuum kettle, evacuate to 100 Pa, then introduce the load liquid into the vacuum kettle until constant pressure is achieved, take out the nonwoven fabric and place it in a tunnel oven, dry it in 60°C dry air for 3 hours to make an antibacterial nonwoven fabric.

[0065] Comparative Example 1

[0066] This comparative example is a blank control. A needle-punched nonwoven fabric was placed in a vacuum kettle, vacuumed to 100 Pa, and anhydrous ethanol was introduced until constant pressure. The nonwoven fabric was taken out and placed in a tunnel oven, and dried in dry air at 60°C for 3 hours to produce an antibacterial nonwoven fabric.

[0067] Comparative Example 2

[0068] The implementation process of this comparative example is the same as that of Example 3, except that the antibacterial particles in step 3) are replaced with the composite antibacterial agent prepared in this example, and the rest is exactly the same as step 3) in Example 3.

[0069] The non-woven fabrics prepared in Examples 1 to 3 and Comparative Examples 1 and 2 were tested for antibacterial properties. The specific test method is as follows:

[0070] Preparation of test bacterial solution: Gram-positive bacteria representative Staphylococcus aureus and Gram-negative bacteria representative Escherichia coli were used as test bacteria and prepared according to the use regulations to a concentration of 4×10 5 CFU / mL of bacterial solution is reserved;

[0071] The nonwoven fabrics prepared in Examples 1 to 3 and Comparative Examples 1 and 2 were tested for antibacterial rate according to GB / T 20944.3-2008. The specific test data are shown in Table 1.

[0072] Table 1 Test results of antibacterial rate of non-woven fabrics

[0073]

[0074] It can be seen from the data in Table 1 that the antibacterial non-woven fabric prepared by the present invention has excellent antibacterial effects on Staphylococcus aureus and Escherichia coli, among which the antibacterial rates of Examples 1 to 3 all reach more than 99.9%. The needle-punched non-woven fabric has no antibacterial effect. The antibacterial effect of Comparative Example 2 is slightly lower than that of the Examples. Analysis shows that the composite antibacterial deteriorates during the preparation and storage process, resulting in a decrease in the antibacterial effect.

[0075] Based on the above test results, in order to explore the antibacterial stability of the antibacterial non-woven fabric prepared by the present invention, 1 mL of the above-prepared bacterial solution was spread on the nutrient agar medium and cultured in a 37°C incubator for 12 h;

[0076] Take the antibacterial non-woven fabrics of Examples 1 to 3, use air with a humidity of 98% and a temperature of 37 ° C, and pass through the sample at 0.2 m / s through a blower to simulate the service conditions of the mask. Sampling is carried out at 10 min, 12 h and 24 h, respectively, to make a disc sample with a diameter of 2 mm, infiltrated with sterile water, and then placed in the middle of the nutrient agar medium. Continue to culture for 6 h, measure the diameter of the antibacterial ring, and the specific test data are shown in Table 2.

[0077] Table 2 Test results of non-woven antibacterial ring diameter

[0078]

[0079] It can be seen from the data in Table 2 that the antibacterial non-woven fabric prepared by the present invention has a sustained antibacterial effect and has a stable antibacterial effect within 24 hours, which can meet the demand for sustained and stable antibacterial effects in masks.

[0080] Throughout the specification, references to terms such as "one embodiment," "example," or "specific example" indicate that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0081] The above contents are merely examples and explanations of the present invention. Those skilled in the art may make various modifications or additions to the described specific embodiments or replace them in similar ways. As long as they do not deviate from the invention or exceed the scope defined by the claims, they should all fall within the scope of protection of the present invention.

Claims

1. A silver ion antibacterial non-woven fabric for masks, comprising a needle-punched non-woven fabric and antibacterial particles loaded in the needle-punched non-woven fabric, characterized in that: The preparation method of the antibacterial microparticles comprises: Step B1: Sodium alginate, gelatin, starch and deionized water are stirred and dissolved at a solid content of 1.2-1.4%, the pH value is adjusted to 9.5-10.0, the temperature is raised to 70-80°C, and the mixture is stirred and mixed to prepare a coating solution; Step B2: coating the coating liquid on the surface of the composite antibacterial agent through a spray coating machine, drying and breaking it up with hot carbon dioxide to produce antibacterial microparticles; The composite antibacterial agent is prepared by the following method: Step A1: γ-mercaptopropyltriethoxysilane and deionized water are mixed, the pH value is adjusted to 5.0-6.0, and the mixture is stirred at room temperature for a first stirring time until fully hydrolyzed. Tetrapod-shaped zinc oxide whiskers are then added and ultrasonically dispersed. The pH value is adjusted to 7.0-8.0, and the mixture is allowed to stand for aging. After the reaction, the supernatant is removed, the mixture is washed with ethanol, and the lower concentrate is centrifuged and freeze-dried to obtain a coupling matrix; Step A2: 1-thioglycerol and ethanol solution are mixed, the coupling matrix is ​​added and ultrasonically dispersed, the temperature is raised to 55-65°C, and stirred at a first stirring speed, while ammonia is added dropwise to react, and then a silver catalyst is added, and the temperature is continued to be raised to 90-100°C and evaporated to dryness, and the evaporated product is used to obtain a modified matrix; Step A3: dissolve silver nitrate and yttrium chloride in deionized water, heat to 75-80°C under nitrogen protection, add ammonia water to adjust the pH value to 8.5, then add the modified matrix and ultrasonically disperse, centrifuge and remove the precipitate, dry it in nitrogen, and prepare a composite antibacterial agent.

2. The silver ion antibacterial non-woven fabric for masks according to claim 1, characterized in that: In step A1, the first stirring time is 10-12 hours, and the static aging time is 24 hours.

3. The silver ion antibacterial non-woven fabric for masks according to claim 1, characterized in that: In step A2, the first stirring speed is 800-1000 rpm, and the reaction time of dropwise addition of ammonia water is 2-3 hours.

4. The silver ion antibacterial non-woven fabric for masks according to claim 1, characterized in that: In step A3, ultrasonic dispersion is performed for 1.5-2 h.

5. The silver ion antibacterial non-woven fabric for masks according to claim 1, characterized in that: In step A1, the ratio of γ-mercaptopropyltriethoxysilane to tetrapod-shaped zinc oxide whiskers is (2.6-3.2 mL):10 g.

6. The silver ion antibacterial non-woven fabric for masks according to claim 1, characterized in that: In step A2, the ratio of 1-thioglycerol to coupling matrix is ​​(1.8-2.5 mL):10 g.

7. The silver ion antibacterial non-woven fabric for masks according to claim 1, characterized in that: In step A3, the ratio of the modified substrate, silver nitrate and yttrium chloride is 10 g: (25-35 mmol): (3-5 mmol).

8. The silver ion antibacterial non-woven fabric for masks according to claim 1, characterized in that: The mass ratio of sodium alginate, gelatin and starch is 1:(0.08-0.12):(0.15-0.2).

9. The method for preparing a silver ion antibacterial non-woven fabric for a mask according to any one of claims 1 to 8, characterized in that: The steps include: Step S1: The antibacterial microparticles and anhydrous ethanol were mixed at a mass volume ratio of 1 g: (20-30 mL), and ultrasonically dispersed into a suspension state to prepare a loading liquid; Step S2: Place the needle-punched nonwoven fabric in a vacuum kettle, evacuate to below 100 Pa, then introduce a load liquid to a constant pressure, take out the nonwoven fabric and dry it with dry air to produce an antibacterial nonwoven fabric.

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